PDA, Handheld and PocketPC Devices

1. PalmOne Treo 650. First choice for phone/e-mail devices, the PalmOne Treo 650, performs better on Cingular's network than on Sprint's, but you'll pay more for the added speed.
Better battery life than the Sprint Treo 650. International voice and data roaming. Fast EDGE modem.

2. Siemens SX66 is a hefty, powerful PDA/phone with a wide range of networking options. Choose this one over similar models if you prefer Wi-Fi hot spots to roaming in EV-DO cities.
Only Wi-Fi phone currently on market. Lots of memory. Good keyboard. Convenient command buttons.
 

3. TDS TerraGuide Navigation. This is not a low-cost outdoor-enthusiast product; think of it as a military-grade PDA for professionals who spend a lot of time working outdoors. GPS performance is good, though the bundled raster topographic maps are not terribly impressive on a PDA screen.

Extremely rugged. Runs on Microsoft Windows Mobile 2003 for Pocket PCs. Two CompactFlash slots.

4. PalmOne LifeDrive. The first PDA on the U.S. market with a hard drive, the palmOne LifeDrive is a device that digital pack rats should love. In fact, the folks at palmOne consider it a mobile manager, one of an entirely new class of handheld products. Its 4GBs of storage should be enough for almost anyone to carry all their critical documents and media. Be forewarned, though: You'll have to recharge the device frequently, and we did encounter some irritating bugs and crashes during our testing, which prevented us from awarding it even higher marks.